All LA County Library locations will close on Monday, April 28 at 6:45 pm. SEIU Local 721 has announced a strike against Los Angeles County starting Monday, April 28, 2025, at 7 pm through Wednesday, April 30, 2025, at 6:59 pm. In the event we have additional library closures, we will share this information on our website. We apologize for the inconvenience and service disruption. Please continue to check our website for updates or visit LACounty.gov/closures.
  • Locations | CONTACT US   |    
       
        ×    
                                           
       
     
     

Diamond Bar Library

Library Hours

  • Monday 10 am - 8 pm
  • Tuesday 10 am - 8 pm
  • Wednesday 10 am - 8 pm
  • Thursday 10 am - 8 pm
  • Friday 10 am - 6 pm
  • Saturday 10 am - 6 pm
  • Sunday Closed

Holiday Closures

Get to Know This Library

About Diamond Bar Library

About Diamond Bar Library

  • Library Size: 18,245 sq ft
  • Space for Children
  • Book Drop
  • Space for Teens
  • Study Rooms: Capacity 4 - 6

Our Collections

Our Collections

Online Collections — Available 24 hours

Special Collection

Newspapers

Our Services

Our Services

Children's Services

Our Computers

Our Computers

  • Public Computers: 11
  • Children's Computers: 5
  • Teen Computers: 6
  • Laptop & Hotspot Kits: 5
  • Express Computers: 8
  • Early Learning Computers: 4

Our Community

Friends of the Library

Friends of Diamond Bar Library a volunteer-run organization that supports the library and library events

Friends of Diamond Bar Library provides the following services to support the library.

  • Friends of Diamond Bar Library Book Store

Library History

Originally opened in 1977, the Diamond Bar Library has long provided valuable services to both residents and visitors.

The Diamond Bar Library at 1061 Grand Avenue was rededicated on August 15, 1998 after renovations made possible by the City of Diamond Bar Redevelopment Agency, the County of Los Angeles, and the Diamond Bar Friends of the Library.

On July 28, 2012, the Diamond Bar Library celebrated the grand opening of the new location at 21800 Copley Drive. The new 18, 245 square foot library is located on the 1st floor of the City Hall building.

Political Representatives

Local Links

Staff Picks (All Ages)

A monthly list of noteworthy titles selected by our Collection Development Services team.

See More Booklists

Cluntywide closures and impacts due to SEIU 721 Strike

LA County Library Prepares For Impact Of SEIU 721 Strike

LA County Library announces the 43 annual Bookmark contest for grades K-12. Click to see the press release.

Read More

children attending an event at LA County Library

LA County Library Welcomes Spring with Arts, Culture, and Community Celebrations Throughout April

LA County Library Announces spring arts, culture, and community celebrations in April

Read More

LA County Library Happenings

Library Happenings April 2025

Check out what's happening at LA County Library this month. Read, celebrate, learn, enjoy!

Read More

2024 LA County Library Bookmark Contest Winners

LA County Library Announces Winners of 45th Annual Bookmark Contest

LA County Library announces the 45 annual Bookmark Contest for grades K-12. Click to see the press release.

Read More